Methane detection scheme based upon the changing optical constants of a zinc oxide/platinum matrix created by a redox reaction and their effect upon surface plasmons

Allsop, Thomas; Kundrat, Vojtěch; Kalli, Kyriacos; Lee, Graham B.; Neal, Ron; Bond, Peter; Shi, Baogul; Sullivan, John; Culverhouse, Phil and Webb, David J. (2017). Methane detection scheme based upon the changing optical constants of a zinc oxide/platinum matrix created by a redox reaction and their effect upon surface plasmons. Sensors and Actuators, B: Chemical, in pre ,

Abstract

We detect changes in the optical properties of a metal oxide semiconductor (MOS), ZnO, in a multi-thin-film matrix with platinum in the presence of the hydrocarbon gas methane. A limit of detection of 2% by volume with concentrations from 0 to 10% and maximum resolution of 0.15% with concentrations ranging from 30% to 80% at room temperature are demonstrated along with a selective chemical response to methane over carbon dioxide and the other alkane gases. The device yields the equivalent maximum bulk refractive index spectral sensitivity of 1.8 × 105 nm/RIU. This is the first time that the optical properties of MOS have been monitored to detect the presence of a specific gas. This single observation is a significant result, as MOS have a potentially large number of target gases, thus offering a new paradigm for gas sensing using MOSs.

Publication DOI: https://doi.org/10.1016/j.snb.2017.08.058
Dataset DOI: https://doi.org/10.17036/researchdata.aston.ac.uk.00000276
Divisions: Engineering & Applied Sciences > Electrical, electronic & power engineering
Engineering & Applied Sciences > Institute of Photonics
Additional Information: © 2017, Elsevier. Licensed under the Creative Commons Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ Funding: EPSRC (EP/J010413 and EP/J010391)
Uncontrolled Keywords: localized surface plasmons,metal oxide semiconductors,optical sensing,gas sensing,fibre optics
Published Date: 2017-08-23

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